Standards
- API 5CT / ISO 11960 (casing & tubing)
- API 5B (threading & gauging)
- ISO 13679 (connection performance validation)
- ISO 15156 (sour service material selection)
The applicable and latest revision is confirmed per project specification.
OCTG Casing & Tubing from Turkey
API 5CT Certified
API 5CT casing and tubing for challenging downhole environments. Sourced from certified Turkish mills with independent QA and full export documentation.
PRODUCT RANGE
Our OCTG Casing & Tubing Portfolio
From standard API threaded products to premium connection solutions for difficult wells, we supply OCTG categories used by drilling contractors and field operators.
CASING
API 5CT Casing
Casing strings for well integrity and collapse resistance across onshore and offshore projects.
Grades: H40, J55, K55, N80, L80, P110, Q125Threading: STC, LTC, BTC + premium optionsLengths: Range 1 to Extra Long
Request API 5CT Casing Quote →
TUBING
Production Tubing
Tubing for production and workover operations in conventional and unconventional wells.
OD starts from 26.7 mm (1.050 in)Hydrostatic tested, NDT and drift-mandrel checksSuitable for directional drilling and fracturing
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CONNECTIONS
Premium & Semi-Premium Connections
Connection alternatives beyond standard API threads for torque capacity, sealability, and harsh service.
Premium and semi-premium threadingHigh collapse L80 and P110 optionsCompatibility with project specs
Request Premium & Semi-Premium Connections Quote →SPECS & GRADES
Technical Scope at a Glance
This page summarizes commonly requested OCTG parameters for fast technical alignment before RFQ finalization.
| Parameter | Range / Standard |
|---|---|
| Product Standard | API 5CT |
| Thread Standard | API 5B + premium / semi-premium |
| Tubing Outside Diameter | 26.7 mm (1.050 in) to 114.3 mm (4-1/2 in) |
| Casing Outside Diameter | 114.3 mm (4-1/2 in) to 339.7 mm (13-3/8 in), larger sizes available by project |
| Wall Thickness | 2.87 mm to 13.06 mm |
| Typical Grades | H40, J55/K55, N80, L80, P110, Q125 |
| CRA Grades | L80 9Cr / L80 13Cr available for corrosive wells on request |
| Thread Types | STC (general), LTC (higher pull-out), BTC (high axial load), premium alternatives |
| Inspection | Hydrostatic + NDT + drift mandrel test per API 5CT |
| Design Reference | Burst/collapse design checks per ISO 10400 / API TR 5C3 |
| Certification | EN 10204 3.1 MTC, optional 3.2 with third-party witness |
| Applications | Well casing, production tubing, directional drilling |
| MOQ | 5 metric tons (standard) |
| Lead Time | Stock 5–10 business days / production 4–8 weeks |
API 5CT Typical Mechanical Properties (Reference)
| Grade | Min. Yield (MPa) | Min. Tensile (MPa) | Max. Hardness (HRC) |
|---|---|---|---|
| H40 | 276 | 414 | - |
| J55 | 379 | 517 | - |
| K55 | 379 | 655 | - |
| N80 Type 1 | 552 | 689 | - |
| L80 Type 1 | 552 | 655 | 23 |
| P110 | 758 | 862 | - |
| Q125 | 862 | 931 | 35 |
Procurement highlights
- Independent QA review before shipment and documentation release.
- Q125 is high-strength and typically handled with special transport/protection; field welding is not recommended.
- Third-party inspection coordination available upon request.
- FOB, CFR, CIF options are supported based on destination and timeline.
Technical Scope
OCTG Technical Scope
A transparent, RFQ-friendly overview of standards, connections, sour service considerations, and QC/testing scope.
PSL Options
- PSL-1 / PSL-2 / PSL-3 availability
- Service-based recommendation (pressure / temperature / environment)
- Optional enhanced testing & traceability packages
PSL selection directly impacts QC scope and certification content.
Typical Design Drivers
- Burst / Collapse resistance
- Axial tension performance
- Connection sealability & torque capacity
- Environment-dependent cracking risks
Use cases: onshore/offshore, directional drilling, workover, fracturing.
Connections
In addition to standard API threads, semi-premium / premium connection alternatives can be offered depending on the project specification and torque/sealability targets.
STC / LTC / BTC
Sealability
Torque Capacity
Premium Threads
STC is used for general service, LTC for improved pull-out resistance, and BTC for higher axial loads. For premium connections, an ISO 13679-aligned validation/qualification approach can be clarified project by project.
Sour Service (H₂S) / Cracking Risks
For sour service conditions, material selection and risk control are evaluated in line with the ISO 15156 family.
- Assessment of service fluid and H₂S/CO₂ conditions
- Grade selection, heat-treatment window, and hardness control (as applicable)
- For sour-service grades, ISO 15156 / NACE MR0175 supplementary chemistry and hardness limits are confirmed in RFQ stage
- Optional additional inspection/testing scope when required
Sour service requirements should be clearly stated in the RFQ.
QC / Testing Package (Typical Scope)
Chemical & Mechanical Tests
- Chemical analysis
- Tensile testing
- Hardness testing (critical for higher grades)
NDT / Inspection Scope
- NDT reference framework: ISO 10893
- Personnel qualification reference: ISO 9712
- Dimensional & visual inspection, lot traceability, and drift mandrel checks
NDT scope and acceptance criteria are finalized per project specification.
Threading / Gauging & Connection Controls
- Thread & coupling gauging checks (API 5B)
- Sealability/performance confirmation (ISO 13679-aligned approach if required)
- Thread protectors & packaging suitability
Certification & Documentation
- EN 10204 3.1 MTC (standard)
- Optional third-party inspection / additional reports
- Export file set: packing list, invoice, COO, etc.
For a clean RFQ, please specify these 4 items: PSL + connection + test package + certificate type.
Need API 5CT
OCTG Supply from Turkey?
Send your grade and connection requirement. Receive a quotation with lead time and document scope promptly.
API 5CT grade coveragePremium connection optionsIndependent QA + MTC
Or email: sales@metalfromturkey.com
WHY SOURCE THROUGH US
Why Buyers Source OCTG via MetalFromTurkey
We combine multi-mill access with commercial coordination and independent QA to reduce procurement risk for energy projects.
Multi-Mill API 5CT Access
Coverage across partner mills helps secure grade and size availability without single-source bottlenecks.
Independent Quality Control
Inspection scope includes dimensional checks, visual verification, and document consistency before dispatch.
Export Documentation Control
Commercial and technical documents are consolidated to support customs and project QA workflows.
Regional Logistics
Door-to-door coordination for EU, Middle East, and Central Asia destinations.
QUALITY & CERTIFICATIONS
Compliance and Traceability
Every shipment is aligned with recognized standards and traceable quality documents.
API 5CT
OCTG product standard for casing and tubing
API 5B
Threading and gauging requirements
Hydro + UT Controls
Hydrostatic and weld line ultrasonic testing
EN 10204 3.1
Mill Test Certificate with shipment
Each OCTG lot is supplied with traceable documentation and quality records to support field acceptance and audit requirements.
Energy Products Team — MetalFromTurkeyINDUSTRIES
Where Our OCTG Supply Is Used
Supply support for upstream projects and related energy infrastructure.
Onshore Drilling
Casing and tubing strings for development and production wells.
Offshore Operations
Corrosion-aware and high-collapse requirements for offshore fields.
Directional Drilling
Tubing solutions for complex trajectories and high-load conditions.
Energy Infrastructure
Project-driven procurement support integrated with pipeline and processing assets.
ORDERING
How to Order OCTG in 4 Steps
A clear process from technical inquiry to delivery.
1
Send RFQ
Share grade, size range, connection type, quantity, and destination details.
2
Technical & Commercial Offer
Receive quotation with lead time, incoterms, and document scope.
3
Production & Inspection
Production is scheduled and inspection data is consolidated for release.
4
Shipment & Delivery
Cargo is dispatched with MTC and export files for customs clearance.
Frequently Asked Questions
Common Questions
What is the difference between OCTG casing and tubing?
Casing supports and protects the wellbore, while tubing carries produced fluids to surface. Both are supplied to API 5CT requirements for oil and gas operations.
Which OCTG grades are available?
Commonly requested grades include H40, J55/K55, N80, L80, P110, and Q125. CRA options such as L80 9Cr / 13Cr can also be evaluated for corrosive environments. Final selection depends on depth, pressure, burst/collapse, and fluid chemistry requirements.
Do you supply premium threaded OCTG connections?
Yes. In addition to API 5B thread forms (STC/LTC/BTC), premium and semi-premium connection options are available based on project specifications.
Are there any restrictions for Q125 grade?
Q125 is a high-strength grade used for demanding wells and usually requires stricter handling. Field welding is generally not recommended, and enhanced testing/protection requirements should be defined at RFQ stage.
What documentation is included with OCTG shipments?
Shipments include EN 10204 3.1 MTC, packing list, invoice, and certificate of origin. Additional third-party inspection records can be arranged.
What is the MOQ and lead time for OCTG orders?
Standard MOQ is 5 metric tons for regular grades and sizes. Stock items can ship within 5–10 business days; production orders typically require 4–8 weeks.
REQUEST A QUOTE
Request a Quote for
OCTG Casing & Tubing
Share your casing/tubing requirements and get a detailed offer in one business day.
Prompt commercial response
API grade and thread feasibility check
Inspection and logistics guidance
Quick RFQ Form
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